Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys
Chirag Dhirajlal Rabadia1,2, Syed Faraz Jawed3, Jincheng Wang1,4
1School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, Western Australia 6027, Australia.
Abstract:
A revised semiempirical approach, considering the average values of the valence electron to atom ratio (e/a̅) and a difference in atomic radii of alloying element/s and the base element (Δr̅), is proposed to predict the twin formation in titanium alloys. The revised e/a̅ versus Δr̅ diagram is plotted, considering the reported results of 90 titanium alloys fabricated using various processing methods. A new twin/slip boundary has been plotted and recommended based on the revised e/a̅ versus Δr̅ diagram. The conventional maximum limit reported for the twinning in titanium alloys is e/a̅ = 4.20; however, it has been found that twinning in titanium alloys is possible up to the e/a̅ of 4.30.
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